Grass plants in a population range in height from 6 cm to 25 cm. The short plants receive little sunlight, and the tall plants are eaten by grazing animals. Which statement best describes the effect of natural selection on the grasses? A. Because average height grass plants are favored, stabilizing natural selection is occurring. B. Because average height grass plants are favored, disruptive natural selection is occurring. C. Because tall grass plants are favored by the animals that eat grass, directional natural selection is occurring. D. Because short and tall grass plants are favored, normal natural selection is occurring.